it will work... right?

ok as some of you may know i blew motor ... two pistons with broke skirts bearings are trashed one piston is disenegrating between the rings and causing loss of comphresion... but lucky for me i found a running motor in a truck with a crushed. all i have to do is swap the tranny from the crushed cab truck to a none crush cabbed truck and i get the crushed cab truck with a fresh rebuilt 350 motor... ok its a 91 with a lil newer and supposedly better tbi... will it work with my 87 wiring harness???? im swapping the pulley system to my 87 cause idk what all it will take to swap it to the serpentine.

I think I would stick with the serpentine belt on the new motor. Sure a lot easier to maintain and swap on the trail if you snap one or somehow throw it. You might also check the difference in alternators on the 2 motors. I know some upgrades were made around 88 and I THINK (it's hard reading GM shop manuals ok?) the 91 will be a 100 amp and the 87 is an 80.

Again, from looking at the books it looks like both wiring harness and parts layout are identical. I think the best thing to do would be to pull the 91 out with all the wire and sensors still in place on the motor and just sit the two side by side to compare.

Also, from experience when you have the 91 out it's a great time to change the O2 sensor, egr, etc. Way easier to do it on the engine stand then in the truck. Also look at the rear main seal and any other gaskets that will be tough to access in the Blazer. I ended up having to change a timing cover gasket 6 months arther I put a 350 in my Jeep - out with the radiator, water pump etc when it would have been an hour job on the stand

Depends on whether u want injection or not. It would be far simpler to just use the motor and swap on a intake and carb on. AFAIK, you can still use the serpentine belts. Otherwise everything should work.

Perhaps some of the guys with lots of swap experience will chime in later. I would simply pull the entire engine with everything attached and install it as a unit - don't change any brackets etc unless you have to deal with AC, then things may be a bit more complicated. Pull the computer from the donor truck, as it will have the correct PROM for the engine and sensors you are installing. You might have to swap the wire harness, but I don't think you will from looking at the book.

Given it's a '91 truck, it's a different body style, (right?) and there are likely some differences in the injection hardware. If you've got the donor, it should be pretty simple even if there are a few differences.

Useful Searches

>
About Us>
>
In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. Since then it has grown to be
a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. CK5 has since expanded
to include the C/K series GM Truck and Suburban as well as past and present GM models.
>>
With its technical articles, factory specifications, photo gallery, classifieds, active message forum, product
reviews and original automotive content it's an unbeatable source.